.main {
    height: 100vh;
    padding-top: 80px;
}
.header {
    position: absolute;
    top: 0;
    height: 80px;
    width: 100%;
    font-size: 18px;
    padding: 0 20px;
    line-height: 50px;
    background-color: #108ee9;
    color: #fff;
}
.header a {
    color: inherit;
}
.menu {
    height: 100%;
    width: 240px;
    float: left;
    background-color: #404040;
}
.content {
    height: 100%;
    padding: 12px;
    overflow: auto;
    margin-left: 240px;
    align-self: stretch;
}
